On Thu, Mar 26, 2020 at 06:09:16PM +0800, Kever Yang wrote: > The image is usually stored in block device like emmc, SD card, make the > offset of image data aligned to block(512 byte) can avoid data copy > during boot process. > eg. SPL boot from FIT image with external data: > - SPL read the first block of FIT image, and then parse the header; > - SPL read image data separately; > - The first image offset is the base_offset which is the header size; > - The second image offset is just after the first image; > - If the offset of imge does not aligned, SPL will do memcpy; > The header size is a ramdon number, which is very possible not aligned, so > add '-B' to specify the align size in hex for better performance. > > example usage: > ./tools/mkimage -E -f u-boot.its -B 200 u-boot.itb
OK, so we're taking a hex input, and that's not clear in the documentation. The example should also be 0x200 for clarity. In fact, being user-space, we need to make this user friendly and sanity check the input and if we're going to take hex in, enforce '0x' as a prefix even I think. Thanks! -- Tom
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